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Patented Jan; 17,1882.

G MWU (ModeL) UNITED STATES PATENT OFFICE; 1

DEXTER. DEHARDY, OF HAVANA, ILLINOIS, ASSIGNOR OF ONEHALF TO CHARLES G. KREBAUM, OF SAME PLACE.

ROTARY SPECIFICATION forming part of Letters Patent No. 252,372, dated January 1'7 1882.

Application filed June 27,1881. (Model.)

To all whom it may concern:

Be it known that I, DEXTER D. HARDY, of Havana, 1n the county of Mason, in the State of Illinois, have invented an Improved Rotary in which like letters of reference refer to like parts, and in whicht Figure 1 represents a sectional plan at y 3 and Fig. 2 sectional side view at m m.

This engine consists essentially of a tubular axle, an eccentric fastened thereto, a toothed wheel revolving upon said eccentric, a cylinder having teeth to fit those of said wheel, and a crescent filling the space between the wheel and cylinder. In this engine the axle is firmly held while the cylinder revolves about it.

A A is the cylinder, with heads F F, and E E is the tubular axle about which the cylinder rotates. On the inside of this cylinder A are cut the cogs or teeth, (shown in Fig. l in sec tion,) running the full length of the cylinder. Through the center of the cylinder A and cylinder-heads F F is passed the tubularaxle E E, firmly held to preventrotation by the sup ports G G. Upon this axle E is firmly fastened the eccentric D, just fitting between the cylinder-heads F F, and provided with two ports, P and P, openin g into the tubular axle E, and extending to the outer circumference 'of said eccentric. D. One of said ports P is nearer one cylinder-head, F, and the other port nearer the other cylinder-head, F. In the tubular axle E E, between the inner ends of the two ports P P, is fastened the plug or bridge L, to prevent the steam from rushing straight through said axle E E.

About the eccentric D, and concentric with it, rotates the gear-wheel G, with its teeth work-, ing exactly into the inside gearing of the cylinder A, as shown in Fig. 1. The radius of the pitch-circle of said wheel 0 plus the eccentricity of the eccentric D just equals the radius of the pitch-circle ot' the inside gearing of cylinder A. This leaves a crescent-shaped space not swept over by the teeth of the wheel 0 or cylinder A. Into this space Ifit the crescent B, not tight, butjust loose enough to allow both the wheel O and cylinder A to revolve easily past it. To prevent this crescent B having any tendency to wedging between said wheeland cylinder, I attach said crescent to the disk R secured firmly to the axle E E and eccentric D. This obliges said crescent B to remain immovable with the axle E E while the teeth of the wheel 0 and cylinder A revolve past it. This disk B revolves in a circular recess in the cylinder-head F. If the distance between the two cylinder-heads F F is some .what far, I may put a disk, R, at each side of the crescent B. If the machine is well constructed, it may run all right without the cresc'ent B being attached to the axle E by the disk R. Radially through this wheel 0, from its inside circumference to the space between each or every other tooth, extend the holes P, two to each space or two to every other space, so that there shall be a series of holes P to each of the ports P.

The axle E E is provided with packing W W at each side of the cylinder-heads F F, to prevent loss of steam.

While in operation the cylinder A rotates together with the gear-wheel (Lwhile the axle E E and crescent B remain stationary. The steam, beiii'g let on at one end of the tubular axle E E, rushes on through one portP of the eccentric 1), through a port or hole P of the wheel 0, and into whatever space it finds between the teeth to which it has'thus come. As

the only way for this space to be enlarged is' another hole P comes into position to receive the steam from said port, and so continue the i'orceof rotation. Theexhaust-steamcontinues on around, being carried between the teeth of both the wheel 0 and cylinderA and the crescent B, and is discharged, when it comes beyond the other end of the crescent B, through the holes P of the wheel 0 and the port P at the other side of the bridge L. In this way the rotation is kept up as rapidly as the steam is allowed to enter. To change the direction of rotation of this cylinder is to let the steam enter at the right-hand end of the axle E E and exhaust at the lefthand side, instead of as it was before. The gear-wheel G, rotating on the eccentric c, and the cylinder A, rotating about the axle E E, cause the ends of said wheel 0 to Wear uniformly on the inside ofthe cylinder-heads F F and disk R, as their relative motion is similar to the well-known Bogardis principle of grinding. r

In Fig. 2 of the drawings the cylinder A is represented as crowning. This is for the purpose of attaching a belt directly to the cylinder as a pulley.

What I claim as myinventiomand for which I desire Letters Patent, is as follows:

1. The cylinder A, provided with uniform and regular in side teeth, and the crescent B, in combination with the spur cog-wheel O, with holes or ports P, the eccentric D, with two ports, P P, and the tubular axle E, with bridge L, substantially as and for the purpose set forth.

2. The cylinder A, provided with regular and uniform inside teeth, and the spur-gear wheel 0, with holes or ports P, in combination with the eccentric D, with ports P P, the crescent B, disk R, attached to said crescent, and eccentric D, and the tubular axle E E, fastened to supports G G, substantially as and for the purpose specified.

3. The cylinderA, provided with. regular and uniform inside teeth, and with cylinder-heads F F, and the wheel 0, with holes or ports P,

and with regular and uniform teeth to gear in with the inside teeth of said cylinder A, for the purpose set forth.

In testimony that I claim the foregoing invention I have hereunto set my hand this 16th day of June, 1881.

DEXTER D. HARDY. Witnesses:

J UDSON STARR, O. N. MIHIGAN, 

